Quad Cortex – Sending Stereo Guitar to FOH and Mono-Summed Guitar to Send 1 for Monitor

Hi!

I’m trying to set up my Quad Cortex for a stereo setup and I can’t get the routing to work the way I want.

Here’s my current setup:

Guitar → Input 1
Vocal (Neumann KMS 105) → Input 2

Guitar path (Row 1&3):
Input 1 → full guitar chain (comp, drives, FX Loop 2 with Lehle volume pedal, delay, reverb) → Out 1/2 (stereo to FOH)

Vocal path (Row 2):
Input 2 → vocal chain → Out 3/4 (stereo to FOH)

All main outputs 1–4 are used for stereo guitar and stereo vocal to FOH.

What I want:

  • A mono-summed version of the processed guitar (after all effects and after the volume pedal) sent to Send 1, going to a active amp for monitoring.

I moved the Lehle volume pedal to FX Loop 2 (Send 2 / Return 2), so Send 1 is free.

Row 4 is currently unused, so I was thinking that’s where I could set up the routing I need help with.

What is the correct way to tap the fully processed stereo guitar signal and send a mono-summed version to Send 1 without affecting the main stereo outputs to FOH? I will also need to be able to control the level of the signal I send from Send 1 to the powered monitor.

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Put a Transparent Blend block on Row 4 and set its Input to the last block in the guitar signal path. This will sum it to mono. You could adjust level from the Output block or put a Gain block on that row.

2 Likes

Ah, thank you! Now it works!

excellent! That Blend block can be pretty useful

For as useful as it is (summing mono), it sure seems like a bug. Too bad sum mono cant be selected as an output (ie output 3, output 4)?

I’m pretty sure selecting a single Output instead of a pair will sum the lane to mono. The biggest difference with the QC is just unplugging one cable will not sum if the Output is still set to a pair. Many other devices sum it at that point. This makes it tricky to sum the QC; you have to adjust settings in your preset rather than just disconnecting a cable

Like @xush mentioned: Having a mono output will sum your stereo signal to mono, you don’t need an extra block.

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I think it’s just takes whichever output you’re selecting and isn’t actually summing to mono. I could be incorrect, but feels strange it would sum it to mono instead of just taking the left or right channel that you select.

Makes more sense that it would not sum to mono